A system and method for constructing an interference component using a detected data symbol and an estimated channel response in a non-orthogonal system and a method of estimating a channel using a structure of the non-orthogonal system and the interference component are provided. The system includes a receiver that receives a reference signal and data transmitted from a transmitter; detects adjacent data symbols around the reference signal; estimates an initial channel state; constructs the interference signal based on the adjacent data symbols and the initial channel state; estimates the channel state on the basis of the constructed interference signal; and perform an iterative process of reconstructing the interference signal based on the basis of the estimated channel state and re-estimates the channel state based on the reconstructed interference signal.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of a receiver for channel estimation by constructing an interference signal, the method comprising: receiving a reference signal and data; estimating an initial channel state based on the received reference signal; detecting adjacent data symbols located in a window that is a range around the reference signal based on the initial channel state; constructing the interference signal due to the adjacent data symbols based on the detected adjacent data symbols and the initial channel state; estimating a channel state based on the constructed interference signal; and performing an iterative process of reconstructing the interference signal based on the estimated channel state and re-detected adjacent data symbols based on the channel state; and re-estimating the channel state based on the reconstructed interference signal, wherein the window indicates a number of data symbols around the reference signal which construct an interference to the reference signal.
2. The method of claim 1 , further comprising determining a window.
3. The method of claim 1 , further comprising calculating a channel estimator J based on the interference signal.
4. The method of claim 3 , wherein the re-detected adjacent data symbols are identified based on the channel state estimated using the channel estimator J.
5. The method of claim 4 , wherein the channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 , where C α represents a channel covariance matrix, σ I 2 represents an interference variance, and σ n 2 represents noise variance.
6. The method of claim 5 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h is calculated by =Jz, where z is Y RS , and G is G = Φ [ 0 ] + ∑ k = - L , k ≠ 0 L - 1 Φ [ k ] .
7. The method of claim 1 , further comprising canceling the interference signal from a received reference signal based on the interference signal.
8. The method of claim 7 , wherein the re-detected adjacent data symbols are identified based on the channel state estimated based on the received reference signal from which the interference signal is canceled.
9. The method of claim 8 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h is calculated by =Jz, a channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 z = Y RS - ∑ k = - L , k ≠ 0 L - 1 Φ [ k ] h , where G is G=Φ[ 0 ], C α represents a channel covariance matrix, σ I 2 represents an interference variance, and σ n 2 represents noise variance.
10. The method of claim 1 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h is calculated by =Jz, a channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 , where z is Y RS ,, G is G=Φ[ 0 ], C α represents a channel covariance matrix, σ I 2 represents an interference variance, σ n 2 represents noise variance, and the noise variance is estimated in the initial channel state.
11. A receiver for channel estimation by constructing an interference signal, the receiver comprising: a transceiver configured to receive a reference signal and data transmitted from a transmitter; and a controller operably connected to the transceiver, the controller configured to: estimate an initial channel state based on the received reference signal, detect adjacent data symbols located in a window which is a range around the reference signal based on the initial channel state, construct the interference signal due to the adjacent data symbols based on the detected adjacent data symbols and the initial channel state, estimate a channel state based on the constructed interference signal, perform an iterative process of reconstructing the interference signal based on the estimated channel state and re-detected adjacent data symbols based on the channel state, and re-estimate the channel state based on the reconstructed interference signal, wherein the window indicates a number of data symbols around the reference signal that constructs an interference to the reference signal.
12. The receiver of claim 11 , wherein the controller is further configured to determine a window.
13. The receiver of claim 11 , wherein the controller is further configured to calculate a channel estimator J based on the interference signal.
14. The receiver of claim 13 , wherein the re-detected adjacent data symbols are identified based on the channel state estimated using the channel estimator J.
15. The receiver of claim 14 , wherein the channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 , where C α represents a channel covariance matrix, σ I 2 represents an interference variance and σ n 2 represents noise variance.
16. The receiver of claim 15 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h is calculated by =Jz, where z is Y RS , and G is G = Φ [ 0 ] + ∑ k = - L , k ≠ 0 L - 1 Φ [ k ] .
17. The receiver of claim 11 , wherein the controller is further configured to cancel the interference signal from a received reference signal based on the interference signal.
18. The receiver of claim 17 , wherein the re-detected adjacent data symbols are identified based on the channel state estimated based on the received reference signal from which the interference signal is canceled.
19. The receiver of claim 18 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h calculated by =Jz, a channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 , z = Y RS - ∑ k = - L , k ≠ 0 L - 1 Φ [ k ] h , where G is G =Φ[ 0 ], C α represents a channel covariance matrix, σ I 2 represents an interference variance, and σ n 2 represents noise variance.
20. The receiver of claim 11 , wherein the channel state is determined by a channel impulse response h, and wherein the channel impulse response h is calculated by z,∵=Jz, a channel estimator J is given by J=W N C α G H (GC α G H +(σ I 2 +σ N 2 )P R H P T ) −1 , where z is Y RS ,, G is G=Φ[ 0 ], C α represents a channel covariance matrix, σ I 2 represents an interference variance, σ n 2 represents noise variance, and the noise variance is estimated in the initial channel state.
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August 4, 2016
March 19, 2019
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